Is CVE-2026-42083 actively exploited?

No active exploitation of CVE-2026-42083 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42083 be exploited remotely?

Yes. CVE-2026-42083 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42083?

CVE-2026-42083 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-42083

HIGH

CVE-2026-42083

CWE-862Published: May 27, 2026· Updated: May 28, 2026

8.2

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:16.7th

Official Description

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. In NewServer(), the smPolicyGroup route group is created and routes are applied without attaching the router authorization middleware. In contrast, other PCF service groups such as Npcf_PolicyAuthorization do attach RouterAuthorizationCheck before route registration. Because the middleware is missing, requests to the /npcf-smpolicycontrol/v1/sm-policies, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/update, and /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/delete endpoints can reach business logic even when no valid OAuth token is provided. This vulnerability is fixed in 4.2.2.

NVD Source

Technical Analysis

CVE-2026-42083 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.2.